Fuel and heat economizer



y 11, 1943- J. 'r. HARRINGTON 2,319,131

FUEL AND HEAT ECONOMIZER Filed March 27, 1941 t as m a? 5 5n? QWWMM.

Jahn I Harrz'ngim Patented May 11, 1943 UNITED STATES PATENT OFFICE rum. AND nm'r aconomzan John T. Harrington. St. Paul, Minn. Application March 27, 1941, Serial No. 385,579

- 4 Claims. r (01.12MB) This invention relates to an improved economizer for use between casings of heating units and chimneys to replace or form and of a smoke-pipe and to provide a control for the.

from the products of combustion may be utilized 7 and absorbed in the heating unitbefore the products of combustion pass therefrompass into the smoke-pipe.

-More particularly, it is an aim of the invention to provide a control for smoke-pipes wherein the hot air and products of combustion from the heating unit will check the old air entering the smoke-pipe, when the drafts of the heating unit are open and wherein the cold air' entering the smoke-pipe will check the passage of the products of combustion and heated air therethrough, when the drafts of the heating unit are closed.

Still another aim of the invention is to provide a device having means whereby the control may be readily varied by adjustment of a single part, to vary the extent to which the products of combustion may be checked in their passage through the smoke-pipe to adapt the economizer to use on any type of heating unitviews, for the purpose of'illustration, i0 desig nates a portion of the floor of a basement, II a portion of the casing of aheating unit which rests thereon and which is provided with an outlet I2 for the products ofcombustion therefrom, and I3 designates the flue of a chimney. These parts are illustrated in Figure 1 and described merely to illustrate the application of the invention, designated generally l4.

fastenings and projects therefrom into the Still a further aim of the invention is to provide an economizer control for a smoke-pipe having'means whereby the cold air which is drawn into the smoke-pipe will be drawn from adjacent the floor so that only the coldest air vertical section of the device,

Figure 2 is an enlarged longitudinal central sectional view of the control or economizer, and

Figure 3 is a cross sectional view of the same taken substantially along the plane indicated by the line 2-3 of Figure 2.

Referring more particularly to the drawin wherein like reference characters designate like or corresponding parts throughout the diiferent inlet end 2| .of the pipe section I I and is attached thereto by nut and bolt fastenings 22. The tapered end of the conical member I! is of .a diameter substantially less than that of the end 2| and is held in substantially concentric relationship therein by means of spacing sleeves 23 which are carried by the bolts of-the fastenings 22.

A conical member 24 is provided with a restricted annular end 25 which fits into the end 2| and which is attached thereto by means of the fastenings 22 and which is held between the end 2| and the spacing sleeves 23. A flared end of the conical member 24 projects outwardly of the end 2| and is flared outwardly relatively to the conical member I9, as best seen .inFigure 2.

A tube 26, which is of substantially less diameter than the conical member I9, is disposed therein and longitudinally thereof and has one end projecting into the outlet end of the pipe section It and its opposite end extending into the end 2| of the pipe section II. The tube 26 is mounted by the fastenings 20 and 22 and is .held in spaced apart, substantially concentric relationship to the pipe sections I5 and I1 and the conical member I9 by spacing sleeves 21 which are carried by the shanks of the bolts of the fastenings 20 and 22. A conical member 28 is provided with a restricted annular portion 28' which is disposed in the end of the tube 26, which extends into the pipe section I5, and is attached thereto by the fastenings 20. A flared portion of the conical member 28 projects outwardly of said end of the tube 26 and into the pipe section It to form the flared inlet end of the tube 26. A tubular member 2! is mounted in the opposite, outlet endof the tube 26 and is provided with a rolled edge 33, at one end thereof, for frictionally engaging the inner wall of the tube 33 sufficiently tight to normally hold the tubular member 23 in an' adjusted position relatively thereto, yet sufliclently loose so that the member 33 may be slid relatively thereto to provide a telescoping connection. The opposite end of the member 23 projects from the outlet end of :the tube 33 and into the pipe section II. The pipe section I1 is provided with an annular baiile 3| having an annular flange 33 which is fastened to the inner wall of the pipe section II by fastenings 33. The baflie 3| projects from the wall of the pipe section II inwardly thereof and toward its outlet end, as best seen in Figure 2, and the tube 33 may be disposed so that its outlet end projects through the opening formed by the bafiie 3 I.

The outlet end 33 of the pipe section I! is tapered and is adapted to be connected either to a flue outlet l3 or, as seen in Figure 1, it may be connected to a section 35 of a conventional smoke-pipe where the distance from the casing I I to the flue I3 is greater than the length of the conduit l5 and under such conditions the pipe section 35 is employed and has one end attached to the outlet end 33 and its opposite end disposed in the chimney flue l3.

It will be obvious that the conduit l3, intermediate of its ends, is provided with a passage 33, which is centrally disposed relatively thereto, an annular passage 31, surrounding the e 33, and an annular passage 33, surrounding the passage 31. -It will also be apparent that the passages 31 and 33 converge toward their outlet ends, as best seen in Figure 2.

The passage 33, at the center of the conduit It, forms the passage for the products of combustion from the heating unit Ii and may obviously be made in various sizes for heating units of different capacities and for different grades and types of fuel in order to take care of the proper amount of exhaust gases. The passage 33 forms an intake for cold air from a cellar or other enclosure in which the heating unit II is situated which cold air enters the pipe section II close to the exhaust end of the passage 33, formed by the tubular member 23, to check the flow of the products of combustion at this point. However, when the drafts, not shown, of the heating unit I I are open the pressure of the products of combustion passing through the passage 33 will reduce the amount of air entering through the passage 33 thereby giving the passage 36 a better draft for freer flow ofthe burnt gases, thus .providing a control It having the necessary flexibility required for modem heating units. The heat of the products of combustion heats the member l3, and the heat radiated therefrom would check the flow of the cold air through passage 33 except for the fact that member 34 is flared outwardly and away products of combustion and by being moved outwardly thereof will increase the flow of the products of combustion and decrease the flow of cold air through the passage 33. The flared inlet" ofthepasssge 33 tendstoincreasethein takeofexhaustgasesthereto'andalsotodeflec hot air through the passage 31. The baile o deflector 3| when used with the conduit [3 in a horizontal position, as illustrated, deflects the cold air from the passage 33 over the outlet end ofthepassagefltochecktheflowthrough passage33. Iftheconduit llisdisposedinanupright position the bane or deflector 3| prevents any back pressure in the conduit which might otherwise force soot outwardly through the passage 33. Due to the fact that the passage 33 entirely surrounds the unit a uniform action-at the outlet end of the passage 3 is produced. Furthermore, the passage 33 eliminates condensation in the chimney, in the pipe 33 and the conduit l3.

As illustrated in Figure 1, if duired, the fuel and heat economizer M can also include a box like casing 33 through which the conduit i3 extends and into which the passage 33 opens. The casing 33 is open only at its bottom at 33 and is provided with depending supporting legs II which rest on the floor II for supporting the open end 33 in an elevated position yet adjacent the floor so that the cold air entering the conduit II will be drawn through the casing 33 and from adjacent the floor to thereby provide means whereby only the coldest air in the enclosure will be drawn through the conduit ll.

Various modiflcations and changes are contemplated and may obviously be resorted to as only a preferred t of the invention has been from the member I3 and is sufllciently spaced therefrom so that the cold air can follow the inner side of member 23 and thereby enter the conduit 15 in suflicient quantity to function efllciently as of the flow of the hot air and combustion gases 7 from the heating unit, the sliding tubular member 29 is provided which, by being moved inwardly of the tube 26 will tend to restrict the flow of'the disclosed.

I claim as my invention:

1. A fuel and heat economizer for furnaces and the like comprising a conduit adapted toreplace a smoke-pipe including end sections of pipe, said pipe sections having adjacent overlapping ends. one of said pipe sections forming the inlet end of the conduit-and the other of said pipe sections forming the outlet end thereof, said outlet section having one and disposed around the end of the inlet section and spaced therefrom to form an annular e therebetween opening outwardly of the conduit intermediate of its ends, and a tube of substantially less diameter than said pipe sections and disposed in the inlet section and coaxially thereof and having one end extending into the outlet pipe section.

2.Adeviceasinclaim1,saidtubehavinga flared inlet end, and said tube combining with the adjacent ends of said pipe sections to form an annular connecting conduit therebetween.

3. AdeviceasinclaimLsaidtubebein'gprovided with a slidably mounted section projecting from its outlet end and extending into the outlet pipe section, said outlet pipe section being provided with an annular inwardly projecting belle disposed adjacent its connected end and through which ,said slidable section extends, said bale having its inner, free edge extending toward the outlet end of the conduit.

4. asmokepipeasinclaimhsaidtubeforming a restricted centrally disposed passage between the inlet and outlet ends of the smokepipe, and provided with a slidably mounted section having one end projecting therefrom and toward the outlet end of the smoke-pipe.

, JOHN T. HARRINGTON. 

